media: v4l2-ioctl: S_CTRL output the right value

If the driver does not implement s_ctrl, but it does implement
s_ext_ctrls, we convert the call.

When that happens we have also to convert back the response from
s_ext_ctrls.

Fixes v4l2_compliance:
Control ioctls (Input 0):
		fail: v4l2-test-controls.cpp(411): returned control value out of range
		fail: v4l2-test-controls.cpp(507): invalid control 00980900
	test VIDIOC_G/S_CTRL: FAIL

Fixes: 35ea11ff ("V4L/DVB (8430): videodev: move some functions from v4l2-dev.h to v4l2-common.h or v4l2-ioctl.h")
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/v4l2-core/v4l2-ioctl.c

@@ -2226,6 +2226,7 @@ static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
 		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
 	struct v4l2_ext_controls ctrls;
 	struct v4l2_ext_control ctrl;
+	int ret;
 
 	if (vfh && vfh->ctrl_handler)
 		return v4l2_s_ctrl(vfh, vfh->ctrl_handler, p);
@@ -2241,9 +2242,11 @@ static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
 	ctrls.controls = &ctrl;
 	ctrl.id = p->id;
 	ctrl.value = p->value;
-	if (check_ext_ctrls(&ctrls, VIDIOC_S_CTRL))
-		return ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
+	if (!check_ext_ctrls(&ctrls, VIDIOC_S_CTRL))
 		return -EINVAL;
+	ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
+	p->value = ctrl.value;
+	return ret;
 }
 
 static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,